Latest post Thu, Aug 23 2012 3:22 PM by taloftus. 9 replies.
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  • Tue, Aug 21 2012 5:45 AM

    • StephenW1
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    Importing XDCAM HD 1080p/25 footage only imports to 1080i/50 project

    I've got some footage here that has been shot on an AF102 using an external Nano Flash Recorder, recording footage to 220mbp/s .mxf files at 1080p/25.
    These files however do not import to a 1080p/25 project, only to a 1080i/50 project - what is even stranger to me is that in the file information under the 'Video' header in the bin reads: 'XDCAM 50MBs 1080p/25'

    The video and audio both play fine, I've tried transcoding the footage within Avid to DNxHD 185x but it only changes the video to a 1080i/50 file (due to the project type). The problem comes with the fact that I have some 720/50 footage recorded on the same camera/recorder that I need to mix with the 1080p footage.

    So I how do I import this footage into a 1080p/25 project? Transcode outside Avid? 5DtoRGB and ClipWrap don't export MXFs to MXF.

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  • Tue, Aug 21 2012 5:49 AM In reply to

    • StephenW1
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    Re: Importing XDCAM HD 1080p/25 footage only imports to 1080i/50 project

    Sorry I should have mentioned that when I import the footage to a 1080p/25 project I get this error:

    "Assertion failed: height == newHeight"

    And when I try using the Media Tool to import the footage Avid freaks out and asks me if I want to Abort/Quarantine etc.

  • Tue, Aug 21 2012 7:20 AM In reply to

    Re: Importing XDCAM HD 1080p/25 footage only imports to 1080i/50 project

    Not sure why it doesn't work, but what happens if you import the 1080/25p footage into the 50i project, then change the project setting to 1080p25? Since the media is recognized as being 1080p25, it should play ball now.

    Same goes for the 720p50, you would normally import that into its own project (set to 720p50), then go back to your working project (1080p25), then file->open Bin and navigate to the 720p50 project and open then bin with the 720p50 clips. You can just use those in the 1080p25 project then. Motion Adapters will be auto-applied. You can modify them using the Motion Effects Editor, or even promote them to reguler Motion Effects from there. By default, the Motion Adapter will speed up the 720p50 footage so that realtime stays realtime (in other words, it will ignore every other frame of the 720p50 footage so that there are 25 frames for every second of actual running time).

    Media Composer Symphony | PT Ultimate | Win10 HPZ | OSX MBP | ISIS5000 [view my complete system specs]
  • Tue, Aug 21 2012 10:43 AM In reply to

    • StephenW1
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    Re: Importing XDCAM HD 1080p/25 footage only imports to 1080i/50 project

    Thank you for replying, I have tried changing the project to 1080p/25 afterwards like you mentioned however I didn't notice any changes (I don't know if this is a good thing...) however I didn't do any tests either so I will have a play around with this again tomorrow. Thank you for the rest of the reply too, I will post back tomorrow.

  • Wed, Aug 22 2012 11:26 AM In reply to

    • StephenW1
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    Re: Importing XDCAM HD 1080p/25 footage only imports to 1080i/50 project

    Talked with the DoP today and the plan has changed so I no longer need to worry about needing to mix 1080i/50 with 720p/50, the whole thing is going to be shot in 1080i/50 - he's still shooting 1080p/25 in-camera though which is still a mystery. So it would be nice for future reference if anyone could chime in with why this is happening. I've talked to a couple of Avid users at they don't understand at all.

  • Wed, Aug 22 2012 11:32 AM In reply to

    Re: Importing XDCAM HD 1080p/25 footage only imports to 1080i/50 project

    Depending on the type of camera and how it is set up, it is very well possible that the chip is scanning the image progressively, but stores this in an interlaced stream. It's much like transferring 25fps film to video, you would have a 25p progressive source, which is stored in a PAL 625/50i signal. Each field represents half of the original frame, but there is no temporal difference between the two fields like there would be with a camera that scans interlaced (50 fields per second).

    What I'm not sure about it how the stream is seen by MC. If it is seen as 1080p25, then that's what the camera is shooting at and storing in. You should be able to import or AMA that into a 1080p25 project.

    If importing into 1080p25 somehow fails, but importing into 1080i50 works, yet the footage is seen as 1080p25 after import, then you should easily be able to switch the project to 1080p25 and edit away. It would not look any different, no, but anything you import or create would be progressive.

    Media Composer Symphony | PT Ultimate | Win10 HPZ | OSX MBP | ISIS5000 [view my complete system specs]
  • Wed, Aug 22 2012 11:57 PM In reply to

    • StephenW1
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    Re: Importing XDCAM HD 1080p/25 footage only imports to 1080i/50 project

    Thank you for this.

    If I set the project as 1080i/50 and attempt to export it gives me the message:
    'No valid resolution found to be exported using same as source.' Check your project.

    If I export as 1080p/25:
    'Long GOP media can not be exported using same as source' Select i-frame and transcode.

    However we are recording in i-frame anyway. Either way I have to transcode before I export same as source and when I do export same as source both project types export as a 1080p/25 project.

  • Thu, Aug 23 2012 6:21 AM In reply to

    • SteveK
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    Re: Importing XDCAM HD 1080p/25 footage only imports to 1080i/50 project

    StephenW1:
    'Long GOP media can not be exported using same as source' Select i-frame and transcode.

     

    I get that error if I try to export XDCAM EX (which is long GOP)

    PS FCP7 will export an XDCAM EX timeline withour a problem, (just does a longer render to remake MPEG long GOP) Why won't AVID?

     

    Numerous clients mojo to Nitris PC systems 6.5 to 2018.3 with interplay with ISIS/UNITY, EVS transfer/w IP director At Home: new 2017 15" i7 MacbookPro... [view my complete system specs]
  • Thu, Aug 23 2012 10:07 AM In reply to

    • StephenW1
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    Re: Importing XDCAM HD 1080p/25 footage only imports to 1080i/50 project

    I'm beginning to think something is very wrong with the recorder we hired, yesterdays footage and todays footage has come in with occassional 'corrupt frame' error messsages in Avid (but also visible in the original MXF files as well), about two or three per days shooting (luckily hasn't really affected the edit) and also a weird glitch coming out of the recorder: it recorded all of day 2/3's footage with each shot split into two files. For example: 10A/2 (part 1) 1.38:14, 10A/2 (part 2) 34:02, which is frustrating but the two halfs all match up to the frame so we haven't lost anything (is there are way to merge clips into a subclip? I can't find any)

    I don't expect anyone to know what is going on here but just shows that it may not exactly be all to do with Avid.
    Thanks for your replies.

  • Thu, Aug 23 2012 3:22 PM In reply to

    • taloftus
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    Re: Importing XDCAM HD 1080p/25 footage only imports to 1080i/50 project

    Howdy-

    I don't know much about 50/25, but we have been using the Nanoflash for a while and I do have a bit of insight into that device...

    The nanoflash records to a fat32 compact flash card, which has a maximum file size of 2gb.  We usually shoot 50Mbps (long form meetings and such), and our files split at around 10 minutes, so if you are shooting 220Mbps, it kinda makes sense that your files will split around 2 minutes.

    The nanoflash "tags" the files as 50Mbps to trick avid to accepting them (as XDCamHD 50), so that is what Avid reports, but my understanding is that the media itself is actually the higher bitrate you recorded.

    The folks at nanoflash are regular posters on the dvinfo.net forum (http://www.dvinfo.net/forum/convergent-design-nanoflash/).  That may be a place to ask some of your other questions.

    Good Luck!

    MC 8.3. Mojo DX, HP xw8600, Win 7 64, 16 GB Ram, Nvidia Quadro FX 3700 [view my complete system specs]
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